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A wire has 8 Q resistance. Calculate the new resistance of the wire if(a)Wire is doubled on it (b) Its length is double by stretchingplease answer fast and correct​

Answer» <html><body><p>The electrical resistance of a wire would be expected to be <a href="https://interviewquestions.tuteehub.com/tag/greater-476627" style="font-weight:bold;" target="_blank" title="Click to know more about GREATER">GREATER</a> for a longer wire, less for a wire of larger cross sectional <a href="https://interviewquestions.tuteehub.com/tag/area-13372" style="font-weight:bold;" target="_blank" title="Click to know more about AREA">AREA</a>, and would be expected to depend upon the material out of which the wire is made.The resistance of a wire can be expressed as <a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a>=ρ  </p><p>A</p><p>L</p><p>where,</p><p>ρ - Resistivity  - the factor in the resistance which takes into account the nature of the material is the resistivity</p><p>L - Length of the conductor</p><p>A - Area of cross section of the conductor.</p><p>From this relation, we observe that the length is directly proportional to the resistance and the area of cross section is inversely proportional to the resistance.</p><p>That is, if L becomes 2 L, R becomes 2 R. R  </p><p>′  =ρ  </p><p>A</p><p>2L</p><p>​ . So, R = 2R'.</p><p>Hence, If the length of a wire is doubled, then its resistance becomes 2 <a href="https://interviewquestions.tuteehub.com/tag/times-1420471" style="font-weight:bold;" target="_blank" title="Click to know more about TIMES">TIMES</a>.</p><p></p><p></p><p></p></body></html>


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